Logic II Counters & Register Lecture 3 Review Questions

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What type of counter is the 74HC163 in the given example?

MOD-16 counter

MOD-8 counter

MOD-10 counter (correct)

MOD-12 counter

What is required for these counters to be synchronously cleared?

Active-low CLR input and PGT on CLK (correct)

Active-low CLR input and POS edge on CLK

Active-high CLR input and NEG edge on CLK

Active-high CLR input and PGT on CLK

What happens if any of the count enable controls is inactive (LOW) in the 74ALS160-163/74HC160-163 Series counters?

The counter will skip counts

The counter will reset to 0

The counter will hold its current count (correct)

The counter will keep counting ignoring the inactive controls

How is the count function controlled in the 74ALS160-163/74HC160-163 Series counters?

By clock signal CLK and inputs A, B, C, D Signup and view all the answers

What is the function of ENT in the 74ALS160-163/74HC160-163 Series counters?

ANDs with ENP to control count function Signup and view all the answers

How can the 74HC163 counter be preset to a specific value?

By applying an active-low LOAD input Signup and view all the answers

What is the purpose of using a decoding network for a counter?

To generate different output signals at specific counts of the counter Signup and view all the answers

Why does the indicator LED method become inconvenient as the size of the counter increases?

It becomes much harder to decode the displayed results mentally Signup and view all the answers

How many AND gates are required to decode completely all of the states of a MOD-32 binary counter?

32 Signup and view all the answers

What are the inputs to the gate that decodes for the count of 21 (that is, 10101₂) in a binary counter?

Q₄ʹ, Q₃, Q₂ʹ, Q₁, Q₀ Signup and view all the answers

What is the purpose of the step-by-step analysis process described in the text?

To predict the next state of the counter based on the present state Signup and view all the answers

What is the main difference between active-HIGH and active-LOW decoding for a counter?

Active-HIGH uses AND gates, while active-LOW uses NAND gates Signup and view all the answers

What is the purpose of the LOAD control input in the 74HC160 counter?

To load the counter with the parallel data inputs Signup and view all the answers

If the D/U control input of the 74HC160 counter is LOW, what will happen when a positive-going transition (PGT) occurs on the CLK input?

The counter will increment Signup and view all the answers

What is the purpose of the MAX/MIN output in the 74HC160 counter?

To indicate when the counter has reached its maximum or minimum value Signup and view all the answers

In the example with the 74HC190 counter, what condition must be met for the RCO (Ripple Carry Output) to be enabled?

The CTEN (Count Enable) input must be LOW Signup and view all the answers

In the comparison between the 74ALS163 and 74ALS191 counters, what is the difference in their LOAD input control?

The 74ALS163 has an asynchronous load, while the 74ALS191 has a synchronous load Signup and view all the answers

In the timing diagram for the 74HC160 counter, what is the initial state of the counter?

0000 Signup and view all the answers